Windows 2012 R2 Windows Search issue. Hangs and doesn't work after day or two been restarted or index rebuild.

[AShulunov]

I have upgraded from Windows Server 2008 R2 x64 to Windows Server 2012 R2 x64. In previous installation I had some issues with Windows Search after Security Roll-up (January or February 2020). It started to hang up till restarted. I've wrote a script and added it to Planner to start one time per night. After system upgrade problem occurred. Been solving it for a week already. What has been done:

1. reinstalled role Windows Search
2. cleaned registry path HKLM\Software\Microsoft\Windows Search
3. index rebuild
4. tons of registry tweaks like CoreCount = 1 and so on.

Problem didn't solved.

Current system been updated with all updates including latest May Security Rollup (May 12, 2020—KB4556846).

I don't have any idea what to do next.

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